# CVE-2026-58655: Grav Flex Objects - Server-Side Template Injection via Dynamic Titles

> An attacker can achieve remote code execution by injecting Twig code into dynamic titles in the Grav Flex Objects plugin.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 15 Jul 2026
- **Updated:** 28 Jul 2026
- **Also known as:** CVE-2026-61605, GHSA-623v-m3c4-3pw8, GHSA-mpq7-q5x9-rf83

## What is CVE-2026-58655?

CVE-2026-58655 is a high-severity code injection vulnerability in getgrav grav, published on 15 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

The bundled Grav Flex Objects plugin (getgrav/grav-plugin-flex-objects) before 1.4.0 contains a stored server-side template injection vulnerability. When rendering dynamic collection or object titles, the plugin passes user-controlled frontmatter values (page.header.flex.collection.title or page.header.flex.object.title) to Twig's template_from_string(), causing them to be evaluated as Twig code rather than treated as text. This path bypasses Grav's Security::cleanDangerousTwig() sanitization. An attacker who can control the title frontmatter of a publicly reachable Flex Objects page can achieve arbitrary Twig execution and escalate to remote command execution via access to internal Grav services such as the scheduler.

Weakness: CWE-94 (Improper Control of Generation of Code)

## Which versions are affected by CVE-2026-58655?


## How do I fix CVE-2026-58655?

No fix has been published for CVE-2026-58655 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-58655 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-58655 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-58655 and fix it if it is affected.

What it is: CVE-2026-58655 is a high-severity code injection vulnerability in getgrav grav, published on 15 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-58655 exists.

Affected product: getgrav grav. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-58655/ (Markdown: https://insights.sbomify.com/CVE-2026-58655/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-58655
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-58655
- OSV: https://osv.dev/vulnerability/CVE-2026-58655

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-58655/
Summaries are generated and may contain mistakes; the official description above is the record.